de.perdian.commons.lang.conversion.support.DefaultWhenNullConverter.java Source code

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Here is the source code for de.perdian.commons.lang.conversion.support.DefaultWhenNullConverter.java

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/*
 * Copyright 2013 Christian Robert
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.perdian.commons.lang.conversion.support;

import java.util.Optional;

import org.springframework.core.convert.converter.Converter;

public class DefaultWhenNullConverter<A, B> extends DelegatingConverter<A, B> {

    private B defaultResult = null;

    public DefaultWhenNullConverter(Converter<? super A, ? extends B> converter) {
        this(converter, null);
    }

    public DefaultWhenNullConverter(Converter<? super A, ? extends B> converter, B defaultResult) {
        super(converter);
        this.setDefaultResult(defaultResult);
    }

    @Override
    public B convert(A source) {
        return Optional.ofNullable(super.convert(source)).orElseGet(this::getDefaultResult);
    }

    // -------------------------------------------------------------------------
    // --- Property access methods ---------------------------------------------
    // -------------------------------------------------------------------------

    public B getDefaultResult() {
        return this.defaultResult;
    }

    public void setDefaultResult(B defaultResult) {
        this.defaultResult = defaultResult;
    }

}